were administered twice to chemically dependent and psychiatric patients to assess the equivalence of booklet-(B) and computer-administered (C) formats. Fifty subjects each were assigned to BC, CB, BB, and CC conditions. The correlations between the formats were high and generally equal to their test-retest coefficients. The formats additionally demonstrated essentially equal scale variances, test-retest reliabilities, and invalid responding rates. In 3 of 4 analyses, computer-based scores underestimated their booklet counterparts slightly but not significantly. Computerized administration was faster and preferred by the subjects. The results support computerized administration, but our data and earlier studies suggest that a slight change in norms may be needed to compensate for its apparent tendency to underestimate booklet-based scores.The authors of the available comparability literature generally conclude that computer-and booklet-administered Minnesota Multiphasic Personality Inventories (MMPIs) yield equivalent scores, but recent reviewers (Ben-Porath & Butcher, 1986;Honaker, 1988) have argued that the equivalence of the two is yet to be established. On close inspection of the literature, it can be seen that equivalence is uncertain and that the computer format's reputed time efficiency is questionable. Equivalence implies that the correlations between formats equal their testretest reliabilities and that they yield similar mean scale scores, variabilities, and profile types. If computerized presentations are to replace the booklet format, they should also equal or improve on the latter's test-retest reliability, proportion of valid profiles, administration time, and consumer acceptance.The literature presents unambiguous and consistent findings in only two of these eight areas. First, consumer acceptance has been uniformly higher for computer-than for booklet-adminis-